Guantanamo nurse in force-feed row
The unidentified nurse made a stand after deciding the practice was a criminal act, said Cori Crider, a lawyer for British legal rights group Reprieve.
"This guy is basically a hero and he should be permitted to give care to detainees that is ethically appropriate," Ms Crider said.
It is the first time a nurse or doctor is known to have refused to tube-feed a prisoner, said US Army colonel Greg Julian, a spokesman for Southern Command, which oversees Guantanamo.
He said the nurse, a lieutenant, had been assigned other duties at the detention centre. "It's being handled administratively," he said.
Guantanamo spokesman, US Navy captain Tom Gresback, did not respond to messages seeking comment.
Ms Crider said she learned about the case during a phone conversation with Abu Wa'el Dhiab, a 42-year-old Syrian prisoner she represents who has never been charged and has been a candidate for release and resettlement since 2009.
She said Dhiab, who is on hunger strike, told her in the July 10 call that he had got to know the nurse very well and that the nurse was apparently the leader of a medical group for two to three months.
"Even before his decision, though, you could tell he was very compassionate," Ms Crider quoted Dhiab as telling her, according to notes she shared of their conversation.
Dhiab said several other medical officers had told prisoners that they did not like force-feeding them but had no choice, Ms Crider said.
"But this one soldier stood up and refused to do it. This takes real courage," Ms Crider quoted Dhiab as saying. He added, according to her: "Refusing to force-feed us was a historical act and a strong statement. We were all amazed."
The US military maintains it uses humane methods to keep hunger-striking prisoners alive, but a federal judge recently ordered officials to review Dhiab's case after he complained of abusive force-feeding.
Saying the manner in which Dhiab was being fed caused "unnecessary suffering", the judge issued a temporary order banning the procedure, but later lifted it to protect him from starvation.
There was a push last year for doctors who force-feed hunger striking prisoners to reject the practice for ethical reasons, but it was unsuccessful, according to Guantanamo officials.
The American Medical Association's president has said that force-feeding hunger strikers breaches core ethical values and a recent editorial in the New England Journal of Medicine urged Guantanamo's prison doctors to refuse to participate.
Hunger strikes at Guantanamo began shortly after the prison opened in 2002, with force-feeding starting in early 2006 following a mass hunger strike. A new strike began in February 2013, with more than 100 of 154 prisoners in custody participating at one point.
There are currently 149 prisoners at the detention centre, and Ms Crider has said the legal team believes about 34 are on hunger strike and some 18 meet the guidelines for feedings.
The US military has refused to reveal the number of hunger strikers since December.